There's a complex part of this game that many either don't know about or don't understand and it causes a lot of what you're looking at. I am not a mobile player so apparel doesn't exist for me but I suspect that might add to the deviation, IDK.
At any rate, this thread goes a long way to helping understand what's going on. Basically, it's a built in random deviation affected by equipment.
http://www.wgt.com/forums/t/145845.aspx
p.s., This statement in the very first paragraph has since changed to replaced the dots with actual numbers......
Each and every club on WGT has a 5 dot rating for each of these categories.